Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/45r17 vs 235/65r16 Tire Comparison Side By Side
  245/45-17 235/65-16 Difference
Diameter inches (mm) 25.68 (652.3) 28.03 (711.9) 2.35 (59.6) 9.1%
Width inches (mm) 9.65 (245) 9.25 (235) -0.39 (-10) -4.1%
Circum. inches (mm) 80.68 (2049.26) 88.05 (2236.5) 7.37 (187.24) 9.1%
Sidewall Height inches (mm) 4.34 (110.25) 6.01 (152.75) 1.67 (42.5) 38.5%
Revolutions per mile (km) 785.33 (487.98) 719.58 (447.13) -65.75 (-40.85) -8.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.83 mph (35.13 km/h)
25 mph (40.23 km/h)27.28 mph (43.91 km/h)
30 mph (48.28 km/h)32.74 mph (52.69 km/h)
35 mph (56.33 km/h)38.2 mph (61.47 km/h)
40 mph (64.37 km/h)43.65 mph (70.26 km/h)
45 mph (72.42 km/h)49.11 mph (79.04 km/h)
50 mph (80.47 km/h)54.57 mph (87.82 km/h)
55 mph (88.51 km/h)60.03 mph (96.6 km/h)
60 mph (96.56 km/h)65.48 mph (105.38 km/h)
65 mph (104.61 km/h)70.94 mph (114.17 km/h)
70 mph (112.65 km/h)76.4 mph (122.95 km/h)
75 mph (120.7 km/h)81.85 mph (131.73 km/h)
80 mph (128.75 km/h)87.31 mph (140.51 km/h)
85 mph (136.79 km/h)92.77 mph (149.29 km/h)
90 mph (144.84 km/h)98.22 mph (158.08 km/h)
95 mph (152.89 km/h)103.68 mph (166.86 km/h)
100 mph (160.93 km/h)109.14 mph (175.64 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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